Using Render in my .rb file

Question

Hi I have some html in a file called (a partial):

_quotemail.html.erb

I Am sending an email to a user and I want to put this html in the email. I am using mailgun.

I can define my email body like so:

body = "text to go in email"

which works great but I want to instead include the HTML I have in my quotemail partial.

Whats the best way to do this?